Vacuum ball valve without adjusting pre-tightening specific pressure

Abstract

The utility model relates to the technical field of vacuum ball valves, in particular to a vacuum ball valve without adjusting pre-tightening specific pressure, which comprises a valve body with a left opening structure and a right opening structure, flange components are fixedly mounted on the left side and the right side of the valve body through matching of bolts, and a ball body is rotatably connected in the valve body. A sealing assembly is arranged between the ball body and the flange assembly; the sealing assembly comprises an annular valve seat clamped and fixed in the valve body, a first ring groove is formed in the end face of the outer side of the valve seat, a third O-shaped ring is movably arranged in the first ring groove in a sleeved mode, a second ring groove is formed in the end face of the periphery of the valve seat, a first O-shaped ring is movably arranged in the second ring groove in a sleeved mode, and a second O-shaped ring is movably arranged in the second ring groove in a sleeved mode. The pre-tightening specific pressure does not need to be provided by the force of a flange bolt, so that the assembly is simple, and the performance (torque, pressure relief amount, service life and the like) of the valve is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum ball valves, in particular to a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure. Background Art

[0002] In the seat structure of the existing vacuum ball valve, the seat is mostly made of polytetrafluoroethylene. The seat is compressed by the assembly dimensions of the valve body and the flange to obtain the pre-tightening specific pressure required for sealing. For example, Chinese Patent No. "CN113915371A" discloses a vacuum ball valve, which seals the flange and the valve body through the cooperation of a ball gasket and a sealing ring. The ball gasket structure proposed by this device is generally made of polytetrafluoroethylene.

[0003] The Young's modulus of polytetrafluoroethylene is about 1.04 to 1.42 GPa. It is difficult to control the machining dimensional tolerances of the valve body and the flange. Even when tightening the flange bolts with a torque wrench, due to the surface machining quality of the workpiece and the batches of bolt and nut standard parts, it is impossible to stably control the initial pre-tightening specific pressure between the seat and the sphere. As a result, for ball valves of the same model and material, due to inconsistent compression amounts of the seats, the opening and closing torques of the valves vary greatly. Even the pre-tightening specific pressure of the valve is insufficient, causing leakage, or the pre-tightening specific pressure is too large, damaging the sealing surface of the seat. Traditional devices usually need to adjust the tightness of the flange connection bolts to change the compression amount of the seat, thereby changing the pre-tightening specific pressure. This is inconvenient for the installation and use of the ball valve and requires multiple adjustments. Therefore, improvements are proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages in the existing technology that it is necessary to adjust the tightness of the flange connection bolts to change the compression amount of the seat, thereby changing the pre-tightening specific pressure. This is inconvenient for the installation and use of the ball valve and requires multiple adjustments. A vacuum ball valve that does not require adjustment of the pre-tightening specific pressure is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] Design a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure, including a valve body with a left and right opening structure. Both the left and right sides of the valve body are fixedly installed with flange assemblies through the cooperation of bolts. A sphere is rotatably connected inside the valve body, and a sealing assembly is arranged between the sphere and the flange assembly;

[0007] The sealing assembly includes an annular seat snap-fitted inside the valve body. A first annular groove is opened on the outer end face of the seat, and a third O-ring is movably sleeved inside the first annular groove. A second annular groove is opened on the outer peripheral end face of the seat, and a first O-ring is movably sleeved inside the second annular groove. The first O-ring and the third O-ring cooperate with each other to seal the flange assembly.

[0008] Preferably, the flange assembly includes a fixed valve cover, and a mating insert block is fixedly connected to the inner end face of the fixed valve cover, and the mating insert block is movably inserted into the valve seat.

[0009] Preferably, a second O-ring is movably sleeved at the insertion joint of the valve seat and the mating insert block.

[0010] Preferably, a flange is fixedly connected to the outer end face of the fixed valve cover.

[0011] Preferably, a valve stem mating groove is formed at the top of the sphere, a valve stem slot is formed on the upper end face of the valve body, a valve stem device is fixedly inserted into the valve stem slot, and the bottom of the valve stem device is inserted and engaged into the valve stem mating groove.

[0012] Preferably, an air extraction through hole is formed inside the valve stem mating groove.

[0013] Preferably, a handle device is fixedly connected above the valve stem device through the cooperation of screws.

[0014] Preferably, an arc chamfer for rotational fit with the sphere is formed on the inner end face of the valve seat.

[0015] A vacuum ball valve without adjusting the preloading specific pressure proposed by the present utility model has the beneficial effects that: the first O-ring and the third O-ring are sleeved on the valve seat, and then the valve seat is placed into the valve body. At this time, the flange assembly and the valve body are fixed by bolts, and the valve seat will be abutted and fixed by the flange assembly, so that the flange assembly and the valve body are tightly fitted, and the assembly dimension between the valve seat and the sphere is clearance fit. At this time, the initial preloading specific pressure between the valve seat and the sphere is provided by the compression force of the O-ring on the valve seat. The preloading specific pressure of this device is provided by the O-ring, and the compression force of the O-ring can be controlled by the groove dimension of the valve seat. In this way, the compression force is stable, and the preloading specific pressure does not need to be provided by the flange bolt force, achieving simple assembly and stable performance (torque, pressure relief amount, service life, etc.) of the valve.

[0016] By providing a second O-ring, the flange and the valve body can be sealed. The valve stem mating groove and the air extraction through hole are formed at the top of the sphere, which is convenient for installation in the valve body and can be closely attached to the valve seats on both sides. The valve stem device is inserted into the valve body and is engaged and fixed with the valve stem mating groove of the sphere. O-rings, gaskets, bearings and other components are installed inside the valve stem. A self-locking handle device is fixed above the valve stem device. In this way, by rotating the handle, the valve stem is driven, and thus the sphere is rotated, and the function of opening and closing the valve can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a vacuum ball valve without adjusting the preloading specific pressure proposed by the present utility model;

[0018] Figure 2 Schematic cross-sectional structure diagram of a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure proposed by the present utility model;

[0019] Figure 3 A vacuum ball valve that does not require adjustment of the pre-tightening specific pressure proposed by the present utility model Figure 2 Partial enlarged view at position A;

[0020] Figure 4 A vacuum ball valve that does not require adjustment of the pre-tightening specific pressure proposed by the present utility model Figure 2 Partial enlarged view at position B;

[0021] Figure 5 Exploded structure diagram of a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure proposed by the present utility model;

[0022] Figure 6 Exploded cross-sectional structure diagram of a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure proposed by the present utility model.

[0023] In the figure: 1, valve body; 2, fixed valve cover; 201, flange; 202, mating insert block; 3, valve seat; 301, first circular groove; 302, second circular groove; 4, first O-ring; 5, second O-ring; 6, third O-ring; 7, sphere; 701, valve stem mating groove; 702, air extraction through hole; 8, valve stem device; 9, handle device. Specific implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Refer to Figures 1-6 , a vacuum ball valve that does not require adjustment of the pre-tightening specific pressure, includes a valve body 1 with a left and right opening structure. Flange assemblies are fixedly installed on both the left and right sides of the valve body 1 through the cooperation of bolts. A sphere 7 is rotatably connected inside the valve body 1, and a sealing assembly is arranged between the sphere 7 and the flange assembly;

[0026] The sealing assembly includes an annular valve seat 3 clamped and fixed inside the valve body 1. A first circular groove 301 is formed on the outer end face of the valve seat 3. A third O-ring 6 is movably sleeved inside the first circular groove 301. A second circular groove 302 is formed on the peripheral end face of the valve seat 3. A first O-ring 4 is movably sleeved inside the second circular groove 302. The first O-ring 4 and the third O-ring 6 cooperate with each other to seal the flange assembly. The first O-ring 4 and the third O-ring 6 are respectively sleeved in the second circular groove 302 and the first circular groove 301 of the valve seat, and then the valve seat 3 is placed into the valve body 1. At this time, the flange assembly and the valve body 1 are fixed by bolts. The valve seat 3 will be abutted and fixed by the flange assembly. At this time, the initial preloading specific pressure between the valve seat 3 and the sphere 7 can be provided by the compression forces of the first O-ring 4 and the third O-ring 6.

[0027] The flange assembly includes a fixed valve cover 2. A mating insert block 202 is fixedly connected to the inner end face of the fixed valve cover 2. The mating insert block 202 is movably inserted into the inside of the valve seat 3. By providing the mating insert block 202, the installation and fixation of the flange assembly can be facilitated.

[0028] A second O-ring 5 is movably sleeved at the insertion joint between the valve seat 3 and the mating insert block 202. By providing the second O-ring 5, the flange assembly and the valve body 1 can be sealed.

[0029] A flange 201 is fixedly connected to the outer end face of the fixed valve cover 2. Through the flange 201, the device and the ball valve can be connected.

[0030] A valve stem mating groove 701 is formed at the top of the sphere 7. A valve stem insertion slot is formed on the upper end face of the valve body 1. A valve stem device 8 is fixedly inserted inside the valve stem insertion slot. The bottom of the valve stem device 8 is inserted and clamped inside the valve stem mating groove 701. By providing the valve stem mating groove 701, it can cooperate with the valve stem device 8 to rotate the sphere 7.

[0031] An air extraction through hole 702 is formed inside the valve stem mating groove 701. By providing the air extraction through hole 702, the air inside the valve body 1 can be extracted to ensure that the ball valve is in a vacuum state.

[0032] Above the valve stem device 8, a handle device 9 is fixedly connected through the cooperation of screws. The handle device 9 can be replaced with a pneumatic handle device or an electric handle device, and can drive the valve stem inside the valve stem device 8 to rotate.

[0033] An arc chamfer for rotational cooperation with the sphere 7 is formed on the inner end face of the valve seat 3. By providing the arc chamfer, the rotation of the sphere 7 is facilitated and the friction is reduced.

[0034] Working mode; during operation, the first O-ring 4 and the third O-ring 6 are sleeved on the valve seat 3, then the valve seat 3 is placed into the valve body 1, and the flange assembly on one side and the valve body 1 are fixed by bolts. At this time, the valve seat 3 will be abutted and fixed by the flange assembly. Then the sphere 7 is placed into the valve body 1, and the flange assembly on the other side and the valve seat 3 are fixed. At this time, the valve rod device 8 is inserted into the valve body 1 and engaged and fixed with the valve rod fitting groove 701 of the sphere 7. In this way, the assembly of the entire vacuum ball valve is completed. By rotating the handle to drive the valve rod, the sphere 7 can be rotated, so as to achieve the function of opening and closing the valve. In this way, the flange assembly is closely matched with the valve body 1, and the assembly dimension between the valve seat 3 and the sphere 7 is clearance fit. The initial preloading specific pressure between the valve seat 3 and the sphere 7 is provided by the O-ring of the valve seat 3, and the compression force of the O-ring can be controlled by the groove dimension of the valve seat 3. In this way, the compression force is stable, and the preloading specific pressure does not need to be provided by the flange bolt force, achieving simple assembly, stable performance (torque, pressure relief amount, service life, etc.) of the valve, and having very good practicability.

[0035] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its utility model concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A vacuum ball valve without adjusting the preload specific pressure, comprising a valve body (1) with a left and right opening structure, characterized in that: The left and right sides of the valve body (1) are fixedly mounted with flange assemblies by means of bolts, a ball (7) is rotatably connected inside the valve body (1), and a sealing assembly is provided between the ball (7) and the flange assembly; The sealing assembly comprises an annular valve seat (3) which is snap-fitted and fixed inside the valve body (1); a first ring groove (301) is provided on the outer end surface of the valve seat (3); a third O-ring (6) is provided on the inner movable sleeve of the first ring groove (301); a second ring groove (302) is provided on the outer end surface of the valve seat (3); a first O-ring (4) is provided on the inner movable sleeve of the second ring groove (302); the first O-ring (4) and the third O-ring (6) cooperate with each other to seal the flange assembly.

2. A vacuum ball valve without adjusting preload specific pressure according to claim 1, characterized in that: The flange assembly comprises a fixed valve cover (2), the inner end surface of the fixed valve cover (2) is fixedly connected with a matching plug-in block (202), and the matching plug-in block (202) is movably plugged into the interior of the valve seat (3).

3. A vacuum ball valve without adjusting preload specific pressure according to claim 2, characterized in that: A second O-ring (5) is movably sleeved at the plug-in connection between the valve seat (3) and the matching plug-in block (202).

4. A vacuum ball valve without adjusting preload specific pressure according to claim 3, characterized in that: The outer end surface of the fixed valve cover (2) is fixedly connected with a flange (201).

5. The vacuum ball valve without adjusting the preload specific pressure according to claim 1, characterized in that: The top of the sphere (7) is provided with a valve stem matching groove (701), the upper end surface of the valve body (1) is provided with a valve stem slot, the interior of the valve stem slot is plugged and fixed with a valve stem device (8), and the bottom of the valve stem device (8) is plugged and engaged with the interior of the valve stem matching groove (701).

6. A vacuum ball valve without adjusting preload specific pressure according to claim 5, characterized in that: An air extraction hole (702) is provided inside the valve stem matching groove (701).

7. A vacuum ball valve without adjusting preload specific pressure according to claim 6, characterized in that: The upper part of the valve stem device (8) is fixedly connected with a handle device (9) by means of screws.

8. The vacuum ball valve without adjusting the preload specific pressure according to claim 1, characterized in that: The inner end surface of the valve seat (3) is provided with an arc chamfer for rotationally cooperating with the ball (7).

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